onsemi BD436T

Overview

BD436T from onsemi is a plastic medium-power silicon PNP bipolar junction transistor rated for 32 V V_CEO, 4.0 A I_C, and 36 W power dissipation at T_C = 25°C, with h_FE = 40–475 (depending on operating point), used in linear amplification and hard-switching circuits in industrial power supplies and motor control stages.

For engineers reviewing the BD436T datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-225 package thermal resistance (R_JC = 3.5°C/W), V_CE(sat) = 0.5 V at I_C = 2.0 A/I_B = 0.2 A, complementary pairing with BD437, and Pb-free RoHS-compliant construction.

Technical Context

The BD436T operates as a medium-power PNP BJT optimized for both analog amplification (with h_FE ≥ 40 at I_C = 10 mA) and switching (V_CE(sat) ≤ 0.5 V at I_C/I_B = 10). Its safe operating area supports DC and pulsed loads up to 2.0 A with V_CE ≤ 32 V under thermal-limited conditions.

It features a single-junction silicon die in a TO-225 package with collector-connected tab (pins 2 & 4), emitter at pin 1, and base at pin 3 - enabling direct heatsinking and fixed-polarity current sourcing in grounded-emitter configurations.

Key Specifications

Pinout & Package

BD436T uses the TO-225 package (Case 77-09, Style 1), with metal tab electrically connected to collector (pins 2 & 4), enabling direct heatsink mounting and simplified thermal management.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power transistor applications.

Compared with BD436G and MJD44H11T4, the BD436T offers identical performance in a rail-packaged TO-225 form factor - making it optimal for through-hole production with automated component feeding, while maintaining compatibility with legacy BD436 designs and thermal management practices.

Availability

BD436T is available at Aetrix Electronics and suitable for industrial power supply regulation, DC motor direction control, and relay/solenoid driver applications requiring stable component supply and long-term manufacturability assurance.

Supply support for BD436T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, with leadership in power management, analog, sensors, and discrete devices.

The BD436T belongs to onsemi's legacy medium-power bipolar transistor family, designed specifically for cost-sensitive, thermally robust linear and switching applications in industrial and automotive-qualified systems.

FAQ

What is the maximum collector-emitter voltage rating for BD436T?

The BD436T has a maximum collector-emitter voltage (V_CEO) rating of 32 V DC. This value is verified per the onsemi datasheet under test condition I_C = 100 mA and I_B = 0. Exceeding this voltage risks avalanche breakdown and permanent device failure. Designers must ensure system transients remain below 32 V or implement clamping circuitry when using BD436T in inductive load applications.

Is BD436T pin-compatible with BD436G?

Yes, BD436T is fully pin-compatible with BD436G - both use identical TO-225 (Case 77-09, Style 1) packaging with emitter at pin 1, collector at pins 2 & 4, and base at pin 3. The only distinction is packaging format: BD436T is supplied in 50-unit rails for automated insertion, whereas BD436G ships in 500-unit boxes. Electrical and thermal specifications are identical across both variants.

What is the typical DC current gain (h_FE) of BD436T at 2.0 A collector current?

At I_C = 2.0 A and V_CE = 1.0 V, the BD436T exhibits h_FE ranging from 50 (minimum) to 475 (maximum), per onsemi's Electrical Characteristics table. This wide range reflects process variation and thermal effects; design margins should assume h_FE ≥ 50 for saturation-critical switching or ≥ 85 for mid-current linear amplification stages.

Does BD436T require a heatsink in continuous 3 A operation?

Yes, BD436T requires a heatsink for continuous 3 A operation. With R_JC = 3.5°C/W and V_CE(sat) ≈ 0.5 V at I_C = 2.0 A, power dissipation exceeds 1.5 W at 3 A - exceeding the 36 W rating only at T_C = 25°C. Real-world case temperatures will rise rapidly without thermal interface and heatsink; a minimum 5°C/W heatsink is recommended for sustained 3 A DC loads.

What complementary NPN transistor pairs with BD436T in push-pull designs?

The BD436T is explicitly paired with the BD437 NPN transistor, as stated in the onsemi datasheet's "Features" section. BD437 shares matching voltage ratings (V_CEO = 32 V), current capability (I_C = 4.0 A), and TO-225 packaging - enabling symmetrical push-pull output stages, Class-B amplifiers, and H-bridge legs without gain or speed mismatch. BD437G and BD437T are the corresponding Pb-free variants.